you want a little bit of movement but not so much that its swaying back and forth, they should look like they're shaking sort of.I have been using 2-3 fans but not blowing directly at it, or on a low setting if I have it swiveling, I heard it's not good to directly blow at them so do they mean like keep it constantly blowing or mean even swiveling
great advice.... air flow can be helped along further down the line by pruning the lower leavesDirect, oscillating air across the canopy is just fine. Just not to close or too strong. Its also good to have some air moving down low to move air up through the canopy...
Your fan is what strengthens the stem, the fan should " wiggle " the plant a little.